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        .masthead h1 {
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            font-weight: 200;
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        h2 {
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                      <h1>Bootstrap</h1>
                      <h4>简洁、直观、强悍的前端开发框架，让web开发更迅速、简单。</h2>
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                        <a class="btn btn-lg btn-primary btn-shadow" href="">Bootstrap3中文文档(v3.3.7)</a>
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                          <a href="">Bootstrap2中文文档(v2.3.2)</a>
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                    <h1>Bootstrap相关优质项目推荐</h1>
                    <p>这些项目或者是对Bootstrap进行了有益的补充，或者是基于Bootstrap开发的</p>
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                        <a href="#"><h3>优站精选</h3></a>
                        <h5>Bootstrap 网站实例</h5>
                        <p>Bootstrap 优站精选频道收集了众多基于 Bootstrap 构建、设计精美的、有创意的网站。</p>
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                            <a href="#"><h3>Webpack</h3></a>
                            <h5>是前端资源模块化管理和打包工具</h5>
                            <p>Webpack 是当下最热门的前端资源模块化管理和打包工具。它可以将许多松散的模块按照依赖和规则打包成符合生产环境部署的前端资源。</p>
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                                <a href="#"><h3>React</h3></a>
                                <h5>用于构建用户界面的 JavaScript 框架</h5>
                                <p>React 起源于 Facebook 的内部项目，是一个用于构建用户界面的 JavaScript 库。</p>
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                                    <a href="#"><h3>TypeScript</h3></a>
                                    <h5>中文手册</h5>
                                    <p>TypeScript 是由微软开源的编程语言。它是 JavaScript 的一个超集，而且本质上向这个语言添加了可选的静态类型和基于类的面向对象编程。</p>
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                                        <a href="#"><h3>Svelte</h3></a>
                                        <h5>中文网</h5>
                                        <p>Svelte 是构建 Web 应用程序的一种新方法。Svelte 是一个编译器，它将声明性组件转换成高效的 JavaScript 代码，并像做外科手术一样细粒度地更新 DOM。</p>
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                                           <a href="#"><h3>Next.js</h3></a>
                                           <h5>中文文档</h5>
                                            <p>Next.js 是一个轻量级的 React 服务端渲染应用框架。</p>
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                                                <a href="#"><h3>Babel</h3></a>
                                                <h5>是一个 JavaScript 编译器。</h5>
                                                <p>Babel 是一个 JavaScript 编译器。Babel 通过语法转换器支持最新版本的 JavaScript 语法</p>
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                                                    <a href="#"><h3>Node</h3></a>
                                                    <h5>中文文档 / 手册</h5>
                                                    <p>Node.js 是一个基于 Chrome V8 引擎的 JavaScript 运行环境。Node.js 使用了一个事件驱动、非阻塞式 I/O 的模型，使其轻量又高效。</p>
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